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OLATHE, Kan. -- The driver Overland Park police say caused a crash that killed a Johnson County sheriff's deputy early on Sunday morning is facing a manslaughter charge. The Johnson County District Attorney's Office says that 38-year-old Adrian Espinosa-Flores of Kansas City, Kan., is charged with involuntary manslaughter while driving under the influence and leaving the scene of an accident.

Overland Park police say that Master Deputy Brandon Collins, 44, was killed while conducting a traffic stop off of U.S. 69 Highway and W. 143rd Street at about 1:30 on Sunday morning. Investigators say that Espinosa-Flores was driving a 2005 Ford F-250 and crashed into the back of they deputy's car, killing him at the scene.

The deputy was a 21-year veteran, and the first member of the sheriff's office to die in 45 years, and the third in the department's history. Sheriff Frank Denning said he was the father of two young girls, a husband and "a very good law enforcement officer."

“It's a very tragic loss on all of those levels and you just wish that you could reach out to all of those people who are really affected by this and really make things better and I can't make things better right now. I think the entire agency today is reeling from what has happened this morning, especially on a day like today when obviously we always look back in the past," Sheriff Denning said.

The sheriff's office announced on Monday afternoon that Deputy Collins' visitation is on Wednesday from 5-8 p.m. at College Church of the Nazarene, located at 2020 E. Sheridan in Olathe. His memorial service is at the same church on Thursday at 2 p.m. A Memorial Fund has now been set up at Mainstreet Credit Union (available at any of their locations) under the account name Deputy Brandon Collins Memorial Fund. https://www.mainstreetcu.org/ 913-599-1010

The Collins family released this statement on Monday:

"We would like to express our sincere gratitude for the outpouring of support and the many heartfelt thoughts and prayers our family has received since our tragic loss. Brandon was a devoted and caring husband, father, son, brother, uncle and friend. Brandon's love and compassion for his family, friends, and the community he served will never be forgotten."

Espinosa-Flores is due in court on Tuesday afternoon, his bond has been set at $2 million according to court records.